Radiobiology > In Utero Exposure > Pregnancy Case Scenarios

Case Scenario – Pulmonary Embolism

A pregnant woman develops progressive dyspnea and tachypnea after a period of prolonged bed rest.  Give the expected radiation dose to the fetus for various studies utilized in the workup of pulmonary embolism.  

(AJR 2006;186:871-876.  Br J Rad 2006;79:441-444.  Radiology 2002; 224:487-492)

External shielding during CT?

The decision on whether to shield the uterus during CT must weigh the expected exposure from internal scatter against the expected external exposure from tube-housing and collimeter leakage.  Unlike external sources of radiation, internal scatter would not be affected by the use of external shielding; instead, one theorectial concern is for back scatter off the lead apron itself and thus redirection of radiation towards the fetus.

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